Hydraulic press



Oct. 11, 1938. H. G, v. SENTANCE ET AL 2,132,974

HYDRAULIC PRES 3 Filed Jan. 4, 1938 1 I ll w y a vw... 5 w -I rIIll Patented Oct. 11,1938 Y V I UNITED STATES PATENT OFFICE- HYDRAULIC PRESS Henry George Valentine Sentance, Glasgow,

Scotland, and George Alexander Vincent Russell, London, England Application January 4, 1938, SerialNo. 183,290 In Great Britain January 9, 1937 2 Claims; (01. 207-3) This invention relates to improvements in hypressure, say accumulator pressure, through teledraulic presses of the type including a main tool scopic supply pipes I2. or punch and an auxiliary tool or mandrel oper- A pair of push-back rams I3 reciprocable in able independently of the main tool or punch, and cylinders carried by or fixed to the base of the 5 particularly to vertical type presses for the exmachine (not shown) act upwardly on the cross- 5 trusion of metal tubes,'bars and the like, and head 2.

has for an object to provide an arrangement In operation, when fluid is exhausted from the whereby a compact construction of press is obcylinders (notlshown) of the push-back rams tained. I3, the main and auxiliary crossheads 2 and 3,

1 A hydraulic press according to the invention respectively, descend together without relative 0 includes a main ram provided with a main cross movement of these crossheads, and the main and head and an independently movable auxiliary auxiliary ram cylinders 8 and 1, respectively, crosshead, the auxiliary crosshead being guided are filled with low pressure fluid from. a prefiller within the main crosshead and carrying an aux-' or overhead tank. T0 efiect operation of the iliary tool or mandrel which passes through the auxiliary tool or mandrel 5, pressure fluid is 15 main crosshead. I admitted to the auxiliary cylinders I to act on the In a practical construction, the main crosshead auxiliary rams Ii, whereby to displace the auxcarries a main tool or punch and the auxiliary iliary crosshead 3 downwardly relatively to the crosshead carries an auxiliary tool or mandrel main crosshead 2, the main ram I meanwhile which may extend axially of the main tool or being or not being, exposed to low pressure or punch for the purpose of piercing a billet prior accumulator pressure, as required. to extrusion thereof through a die-ring or the The auxiliary crosshead 3 is unitary with a like, the work being supported below the main slipper 3 engaging opposed guide faces I4 crosshead, i. e., on the side remote from the within a central cavity in the main crosshead 2.

auxiliary crosshead. An enlargement I 5 of the spindle of the auxiliary 25 A hydraulic press according to the invention is tool or mandrel 5 is guided'in a guide-forming illustrated in the accompanying drawin'ginwhich bore I6 in the main crosshead.

Fig. 1 is a vertical section on the line aa of We claim: Fig. 2, and Fig. 2 a part elevation part vertical I 1. An hydraulic press comprising a mainvram, section on the line 12-!) of Fig. 1. a main crossheadmovable with said main ram, 30

The hydraulic press shown includes a main guides for the ends of said main crosshead, a ram I provided with amain crosshead Z in which main tool carried by said main crosshead, said moves an auxiliary crosshead 3 which is operable main crosshead having a Central a y presentindependently of the main crosshead 2 by'a pair ing Opposite p gu de Surfaces close to the 5 of auxiliary rams 6. axis of said main ram, an independently movable Th headz i s a, m i t 1 h 4 auxiliary crosshead including a central slipper and the crosshead'3 carries an auxiliary tool or portion unitary therewith and bearing on d m d l 5 whi h t ds axially ithi th n guide surfaces of the main crosshead, auxiliary tool 4 for the purpose of piercing a billet prior rams n pp t sides of said m n r m f r 40 t t i n thereof through di ring or th operating said auxiliary crosshead, return rams 40 m t, h 7 i for said auxiliary crosshead, said return rams The auxiliary rams 6 work in fixed auxiliary being carried by said main crosshead, and anv cylinders 1 disposed one on each side of the fixed auxiliary flo ca ried by S d auxiliary c osshead main overhead cylinder 3 accommodating and extending through said main crosshead. V

main ram I', the cylinders I being carried by the An Y Pr as clalmed In Claim 1 in 45 v usual frame structure 9 which carries themain "which the'auxlllaryjams have s, a d the cylinder 8. The crosshead 2 carries a pair of t rams (flamed by the main s head are return rams III for the crosshead 3, said return. reclprocable in S S- rams I0 working in barrels constituted by bores II within the rams 6 and. either directly connected 1 HENRY NCE. 50

to or'valve-operated from a source of uniform V GEORGE A. V. RUSSELL. 

